"Dojos generate armies faster."—In-game description
Kamidana is a technology in Age of Empires III: The Asian Dynasties that is unique to the Japanese and can be researched at the Dojo once the Industrial Age is reached. Once researched, it reduces the time at which the Dojo spawns units by 25%, which means that the Dojo spawns units 33% faster.
Kamidana should be researched as soon as possible to get the most use out of the Dojo.